The fifteen-year-old actress is encouraging people to redesign the classic orange collection box and enter the "Create-a-Character" Halloween contest.

CAUSE: Trick-or-Treat for UNICEF started on Halloween 1950 as a way to raise money for children in post-World War II Europe, and the tradition continues today as trick-or-treaters go door-to-door to ask for small change donations. UNICEF promotes the simple, effective concept of kids helping kids—and by fundraising on one night, children can raise millions for those suffering in other parts of the world. Chloe Morez—who just finished filming the spooky re-make of Carrie—has joined UNICEF's campaign. She's promoting the "Create-a-Character" contest, which urges kids to get creative and design their own collection bos.

EFFECT: In the past sixty years, Trick-or-Treat for UNICEF has raised over $167 million to help kids in need. Recently, UNICEF provided educational opportunities to orphaned children in Nepal.

GET INVOLVED: Request a blank UNICEF collection box, draw a character on it, snap a photo, and then upload it online before Oct. 26. Three characters will be chosen to appear on a limited-edition set of collection bos for next year's UNICEF campaign.

"For more than 60 years, millions of people have collected donations and fundraised on behalf of UNICEF during Halloween. This year, I'm so excited to be supporting Trick-or-Treat for UNICEF because trick-or-treating has always been one of my favorite things to do with my family and friends."

"On Halloween this year, I'll be in London filming Kick-Ass 2. Our family friends throw the biggest Halloween party at their home, and their daughter is one of my best friends. I think my brother Trevor and I are going to go as characters from Snow White and the Huntsman—if I can talk him into it!"

"My all-time favorite costume I've worn was the Black Swan ballerina. My stylist and I spent three weeks making the entire ensemble—from the crown to the black feathered tutu—it was so beautiful."

"What's fun about this year's campaign is that can do even more than go door-to-door to collect money. Through the 'Create-a-Character' contest, you can design your own collection box. If you submit your design, you'll be entered in a contest that gives you a chance to have your idea be part of the limited-edition bos for Trick-or-Treat for UNICEF in 2013. Start by ordering a fundraising kit to receive a blank box, and check out my design!"